When used with a momentary push button or keyswitch, the TM-9 will unlock a door for the timer`s pre-set time. Features: Miniature timer extends momentary switches up to 36 seconds. Commonly used in outlet boxes with push buttons or keyswitches. Fits in the backbox or can be mounted separately with double stick tape. 3 Amp SPDT relay energizes for 2 to 36 seconds. Time setting is selected by DIP switches rather than by a potentiometer. Applications include releasing electric locks and shunting alarm contacts. Voltage: 12 or 24VDC, or 24VAC